1 #ifndef _LINUX_DELAY_H
2 #define _LINUX_DELAY_H
3
4 /*
5 * Copyright (C) 1993 Linus Torvalds
6 *
7 * Delay routines, using a pre-computed "loops_per_jiffy" value.
8 */
9
10 #include <linux/kernel.h>
11
12 extern unsigned long loops_per_jiffy;
13
14 #include <asm/delay.h>
15
16 /*
17 * Using udelay() for intervals greater than a few milliseconds can
18 * risk overflow for high loops_per_jiffy (high bogomips) machines. The
19 * mdelay() provides a wrapper to prevent this. For delays greater
20 * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
21 * specific values can be defined in asm-???/delay.h as an override.
22 * The 2nd mdelay() definition ensures GCC will optimize away the
23 * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
24 */
25
26 #ifndef MAX_UDELAY_MS
27 #define MAX_UDELAY_MS 5
28 #endif
29
30 #ifndef mdelay
31 #define mdelay(n) (\
32 (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
33 ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
34 #endif
35
36 #ifndef ndelay
37 static inline void ndelay(unsigned long x)
38 {
39 udelay(DIV_ROUND_UP(x, 1000));
40 }
41 #define ndelay(x) ndelay(x)
42 #endif
43
44 extern unsigned long lpj_fine;
45 void calibrate_delay(void);
46 void msleep(unsigned int msecs);
47 unsigned long msleep_interruptible(unsigned int msecs);
48 void usleep_range(unsigned long min, unsigned long max);
49
50 static inline void ssleep(unsigned int seconds)
51 {
52 msleep(seconds * 1000);
53 }
54
55 #endif /* defined(_LINUX_DELAY_H) */
56
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